Exposure models traditionally have emphasized the statistical association between process
parameters and measured exposures. These empirical-statistical models can identify factors
important in controlling exposure, but are difficult to generalize for various reasons. Different
modeling techniques may have wider applicability. Known as empirical-conceptual models,
they are based on a conceptual analysis that identifies contaminant generation and
transport processes leading to the exposure. Dimensional analysis is used to group …

Although local exhaust ventilation reduces exposure to airborne contaminants, current
design methodology is limited because the relationship between exposure and ventilation is
seldom known for a specific industrial operation. This research addressed this deficiency by
introducing the notion of an empirical-conceptual model. These models relate exposure to
ventilation through various process parameters responsible for the generation and transport
of contaminants. To illustrate the modeling technique, an empirical-conceptual model of a …